I've been butt-chugging viagra for years. It always upset my stomach and I was familiar with butt chugging from my college years.
The best solution that I found is just warm water and dissolved viagra. It'll uptake in your system super fast. Much faster than if you take it orally.
Be prepared for an instant hardon.
I usually use a gallon enema bag with an inflatable anal bulb so I don't have to worry about it coming out or dripping.
I put a towel down on the bed first.
Fill up the enema bag with warm water, I like it as hot as possible as the heat will dilate your sphincter and increase and accelerate uptake.
I usually take a 100mg blue pill with a cup of water, put it in the microwave and it dissolves almost instantly when it heats up.
Then I take it out, stir and then pour in the enema bag.
I lube up. Put the inflatable butt plug in me, pump it up to form a nice seal.
Take the enema hose, make sure there's no air in it, then hook it up to the butt plug.
Then I lay down flat on my back and open the valve, slowly.
Then just lay and relax as it fills you up.
If you're a normal person you'll get a stiffy in a few minutes.